Currently stock 5.3 flex fuel 2009 Silverado with a cold air intake and nothing else. I’m gonna be adding a comp cams 54-454-11 cam, new springs, headers and exhaust and a blower at some point. Probably gonna end up moving to an all forged ly6 lower end in the next few years but trying to add small upgrades that will work with my 5.3 so when I drop 5 k for the new block and ls3 heads thats all the big purchases I’ve got to make along with tuning. To that end I’ve got my eyes on these 6.2 flex fuel injectors. Doing my own research this will support my goals of about 700 horsepower down the road but will also work well on my 5.3 and will be a direct replacement for my current injectors. Is this true?

 

you need more injector

 

Deka 80s?

 

Also heard conflicting things on the flex fuel pump. You think a single 450 would work?

 

What fuel you going to run?

 

Predominantly e85 since its readily available around here in middle tn and for performance. Although I’ve heard e85 can be worse in cold weather and some manufacturers recommended an occasional tank of 91/93 to “clear things out”. Don’t know how true that is tho. Since I’m gonna be running boost I’d rather have too much injector and eventually grow into it.

 

I am right about 700 hp. I am on E85 and running twin 340's and 1250cc injectors at about 60% DC.

 

If you are talking 700whp on E you well definitely need more pump and injector. As you can see terravast4 is basically double what you would have thought you'd be OK at. While you can and many do run IDC higher than 80% I would shoot to stay under that.

Dual intank options:
Aeromotive 340's
Deatchwerks 300's or the Brushless 440
Walbro 400, 450, or 525's
Bosch 044's
AEM 380 or 400's

Basically whatever you can cut a stock bucket up to fit any of the above to shoehorn into the tank.

I also like the idea of a surge tank setup for the simple fact you leave the OEM tank alone other than running the supply line to the surge tank. So no messing with fuel level sender, no worrying about running less than a 1/4 tank, and the OEM pump will provide ample amounts of fuel to the surge tank as it is zero or very little restriction (free flow essentially).

Injector wise, I'm a fan of ID, so a 1300 or 1700 but I'm giving SEP1500's a shot right now and see how they work out.

 

Thanks for the help guys you’ve given me a lot to consider! Can’t wait for the weather to warm up to get to the nitty gritty